The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

The series of extinctions that occurred during the Ordovician and Silurian periods between 445 and 415 million years ago wiped out as much as 85 percent of all animal species on Earth. It was the ...

The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

Armoured jawless fishes known as ostracoderms now have a healthy Silurian record; the oldest complete examples of these animals date to even older deposits of the Middle Ordovician epoch ...

During the Silurian period, which succeeded the Ordovician, these survivors repopulated the oceans. Mitchell has focused much of his work on a group of filter feeders that the extinction hit ...

We study trilobites from four periods of the Palaeozoic: the Cambrian, Ordovician, Silurian and Devonian. Our research covers trilobite taxonomy, phylogeny, functional morphology, biogeography, and ...

They used chemical abrasion-isotope dilution-thermal ionization mass spectrometry zircon U-Pb dating techniques to obtain high-precision dates from ash beds in the Ordovician–Silurian ...